Motorcycle helmet



FIG. 1 is a front perspective view of a motorcycle helmet according to my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings depict portions of the motorcycle helmet that form no part of the claimed design. 

CLAIM I claim the ornamental design for a motorcycle helmet, as shown and described. 